Printing-film



NITED STATES PATENT anion.

PRINTING FILM.

SPECIFICATION forming part of Letters Patent No. 3825,0 22, dated May 15, 1888.

Application filed Febauary 17, 1887.

To ctZZ whom it may concern.-

Be it known that I, PASGHAL GnoGERY CASPIAN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in PrintingFilms, of which the following is a specification.

My invention relates to an improvement in printing-films, designed for use for artistic and decorative purposes, and for printing and the preparation and finishing of drawings, and printing and copying surfaces.

The object of my invention is to produce a printing-film of maximum durability and flexibility, and which shall be insoluble in Water.

In order to produce such a film, an impression or matrix is first taken from a relief print ing surface or form by means of pressure in any suitable material. I support this matrix or impression, face upward, upon an even surfacesuch as a plate of metal orglasswhich is warmed to a suitable degree. I then prepare a mixture of the following ingredients: Gelatine or isinglass, one ounce; water, three ounces; bichromate of am monia, twenty grains; glycerine, two dramsthis proportion being varied according to the season, using more biohrornate in winter and more glycerine in summer. This mixture is melted by heat, and is poured upon or flowed over the matrix or impression, thereby forming a film having a raised printing-surface, which, when set or cooled, is flexible, elastic, and nearly transparent. The film is then exposed to thelight- Serial No. 227,949. (No specimens.)

for about two hours, and is then coated with a lacquer of saturated solution of Monsel salt or other solution of iron, after which the film is washed and allowed to dry, when itisready for use. A printing-film thus prepared is not soluble in water, and hence can be used in rainy and damp weather, an advantage which printing-films of this class have not heretofore possessed.

This film is adapted for use in connection with my improved shadographic-outline machine, No. 227,948,filed February 17, 1887, and is adapted to be formed with straight or waved lines or a stippled raised surface, and adapted for use in shading drawings in various grades of lines.

Having thus described my invention, I claim 1. A printing film or pellicle having a raised printing surface, composed of gelatine, water, bichromate of ammonia, and glycerine, in about the proportions described.

2. A printing film orpellicle having a raised printing-surface composed of glyoerine, water, biehromate of ammonia, and gelatine, and coated with a lacquer of saturated solution of Monsel salt or other solution of iron, substantially as described; 7

In testimony that I claim theforegoing as my own lhave hereto ai'fixed my signature in presence of two witnesses.

PASGI-IAL GROGERY GASPIAN.

IVitnesses:

ROBT. MoOURDY, EDw. A. BUTLER. 

